Light source



FIG. 1 is a front elevational view of a light source showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a perspective view of a light source showing my new design; and,

FIG. 6 is another perspective view thereof. 

CLAIM The ornamental design for a light source, as shown and described. 